Fire pot



J. R. JOHNSON FIRE POT March 8, 1927. 1,620,353

Filed May 22, 1925 awwmtoz 25 W w/w M/WW Patented Mar. 8, 19 27.

i 'UNl'l'El) STATES crack. These injurious effects are accentuated bythe alternate cooling and heating following the shutting ofi and turningon of the burner with the action of the thermo static control, usuallyprovided. As the'fire pot is usually sealed in the boiler and ispartially covered over with the lining ring,

- these injuries or defects in the pot may not become known until anaccident accurs.

Thus in the case of a cracked fire pot, if after a period of rest, theburner should fail to ignitei the oil discharged from the boiler, insteashut-ofi, will simplyleak through the-break in the pot and collect inthe fire box, where it may burn or explode when ignition is laterattempted.

It is to cure the above dangers and defects that my present invention isdirected. This is accomplished in a comparatively simple 'but practicalway by providing a jacket about the fire pot and circulating a y coolinfluid therethrough.

In t e present disclosure, water or steam is used as the cooling mediumand a further novel feature of the invention consists in utilizing thismedium either for the purpose of returningheat to the boiler or forheating the. domestic water supply.

Additional novel features of the invention will appear as thespecification proceeds.

In the accompanying drawing, one practical embodiment of the inventionis illustrated, but it should be understood that the structure-and modesof use may vary wlthout departure from the spirit and scope of theinvention as hereinafter defined and Figure 2 is' a vertical sectionalview of Application filed Kay 22,

of collecting in the fire pot and draining back to operate the safety'of the PATENT o I'IBE POT.

1925. Serial K0. 32,054.

the fire pot in its relation to the burner head.

the fire pot as on substantially the plane of line 3-3 of Figure 2.-

In the particular installation shown, the fire pot, indicated generallyat 5, has a front open ng 6' for the reception of the burner head 7 andside openings 8 for the branches 9 of the air duct 10.- As usual inburners of this type, the' air entering the fire pot through the passes11, mingles with the dischar e from the burner head and burns within thebowl of the pot. The side. walls of this bowl are convergent 0roverhangingas indicated at 12 so as to exert a confining effect,romoting more complete combustion. mbustion is further controlled andpromoted by thelining ring 13 of-refractory material which seats withina flange "14 and FFICE.

JO N JOHNSON, OF GREENWICH, CONNECTICUT.

Figure 3 is a horizontal sectional view of has convergent inner walls 15forming in effect a continuation of the overhanging walls of the bowl.

The mouth 16 of this ring is sufliciently restricted to hold the flameunder control and direct it against the 'heat absorbing interior wallsof the boiler 17. The bottom pot is shown as inclined to the center at18 to collect the oil which may not be ignited and drain the samebackthrough piping 19 to the dri pan 20 which operates to rock the shut-othe latter parts not being shown in detail because usedin present wellknown installations.

The bowl portion of the fire pot is shown as entirely surrounded by awall 21, forming a jacket orspace 22 surroundin the pot and providing achamber for ho ding or circulating a cooling medium. The side portion ofthis outer wall is shown in Figure 2 as substantially cylindrical and asprojecting slightly beyond the lining ring flange, forming with theinwardly. inclined in the upper. part of the cooling jacket.

A maximum cooling' space is thus provided without materially increasingthe overall dimensions of theffire pot and without interfering with theconnection of the fire pot to the burner head and air flues. In thisillustration the cooling jacket stops short of the front, end of thefire pot so as to leave the usual attachment flange 24 free to receive'the bolts by which the pot is usually mounted.

. An inletand an outlet for the cooling 2 'fluid are provided in thepresent instance in circulation. If air is used as a circulating medium,suitable piping for the purpose may be connected with such inlet andoutlet and may be forced under pressure by a branch taken off from theair conduit 10 for instance.

In Figure 1 there is illustrated the possibility of using the fire poteither as a hot water, heater or as ameans for boosting or returningheat to the boiler. The piping for this purpose comprises a section 27connected with a water main 28 and having a branch 29 in communicationwith the lower portion of the boiler with valves at 30 and 31controlling the water line and boiler connection respectively, for theinlet side; the outlet piping comprising a section 32, 33 leading to ahot water tank 34 and a branch 35 extending back to the'top of theboiler, the hot water feed and boiler return connections respectivelybeing governed by valves 36, 37

In this particular embodiment it will be seen that if the valves 30, 36are closed and the valves 31, 37 are open, water or steam from theboiler will be passed through the jacket of the fire pot and by anatural flow will be returned back into the boiler. the other hand, ifvalves 31, 37 are closed and valves 30, 36 are opened, water from themain will be permitted to flow. through the jacket of the fire pot andthen on into the tank. In either event the fire pot will be cooledsufiiciently to revent'scaling, cracking or warping of t e same and thisflow will have a tendency to maintain the fire pot at a temperaturefavorable for re-ignition of. the fuel each time the burner is started.after a shut-off period. The jacket about the fire pot is an extrasafety feature, providing in case of a defect in the bowl of the pot, 'areceiver for catching any unconsumed fuel.

What is claimed is:

1. The combination with a burner, of a fire pot positioned to receivethe discharge of said burner, a cooling jacket surrounding the bowl ofsuch fire pot, a boiler heated from said fire pot, means for circulatingfluid from the boiler through the cooling jacket of'the fire pot andback into the boiler, a hot water storage system connected with thecooling jacket and means for selectively cont-rolling connection of thejacket with the boiler and with the hot water storage system. 7

2. A fire pot for oilburners constructed as a unit separate from andindependent of the burner structure comprising a flame confining bowladapted for mounting in the combustion chamber of a furnace as a unitindependent of the furnace structure, said bowl being. open in the sidethereof to admit the combustion supporting air and the flame of a burnerdirected into the bowl but being otherwise closed about-the sides andbottom of the bowl and open at the top, a jacket when the burner is onan'd a measure of the heat is retained in the fire pot when the burneris off.

In witness whereof, I have hereunto set my hand this 21st day of May,1925.

JOHN R. JOHNSON.

